"This is a typical ploy, particularly by health and local authorities," said Stephen Bubb, chief executive of Acevo. "The money CSV has lost as a result of the interest should be pursued."
CSV has calculated it is losing as much as £3,000 a week in interest because of the delay. Bubb believes that if it went ahead with the invoice, it would be the first charity to take such a course of action. He said: "The sector needs to get more aggressive. The Government wouldn't dare do this to a private contractor."
CSV is continuing to seek legal advice, despite a promise by the DoH that it will release the money this month.